That is a good idea. I've done the same thing with fewer columns. Also, I have a few different programs and an excel sheet for each. I have one for when I'm in my home/work area, one for when I travel north, one for north west and two for west depending on exactly where I'm going. This helps to keep the file smaller and more manageable. If I ever take a different path, I'll set up a new one.
A friend in my area does the same thing.